doing my nut at the moment

brakes gave me shit so i stripped the master cylinder and put a new kit in - no joy.checked the master cylinder(4 seals) and see rust , so bin it in favour of a newer ATE unit complete with booster i had (six seals in this one) , fit a new kit and now the bastard is binding. ive had it off twice already but still no joy , and doing my F*&^%N nut

any ideas or diagrams of the six seal unit appreciated